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Finding the Fourth Proportional to 209,799,253.80, 314,698,880.70 and 128,169,916.20

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Solution

The fourth proportional to 209,799,253.80, 314,698,880.70 and 128,169,916.20 is: 192,254,874.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,799,253.80 : 314,698,880.70 = 128,169,916.20 : x
  2. Step 2: Convert to fraction form
    209,799,253.80/314,698,880.70 = 128,169,916.20/x
  3. Step 3: Cross multiply
    209,799,253.80x = 314,698,880.70 × 128,169,916.20
  4. Step 4: Simplify right side
    209,799,253.80x = 40,334,929,167,552,800
  5. Step 5: Solve for x
    x = 40,334,929,167,552,800/209,799,253.80
  6. Step 6: Final answer
    x = 192,254,874.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.